Here is a clearer, more close-up shop, where you can see that some of the jagged bits are actually birds:
The scale here, and in all of the photos where it appears, is a 50-cent coin which is 32 mm across. Now here is some faulting, in two views.
We got more of the same at Mystery Bay, which got its name when a geologist and his party disappeared:
From somewhere else, I gathered that the boat was not only holed, but it was stove out, rather than stove in, indicating foul play, as did the presence of personal property in the boat. There is more detail here. The source is the Illustrated Sydney News of November 20, 1880. If you turn over to page 12, you will find this picture:
Links to the other four parts: